The device is powered entirely by the receiver, drawing only limited current, and switched output load is electrically isolated from the R/C circuit ... What you and your RC system control with it is ...

An RC circuit in series with the coil allows full-current turn-on for reliable relay ... closed until the drive voltage is removed. In this example the resistor value is roughly twice that of ...

While passive precharge employs a power resistor to create an RC circuit that charges the capacitor asymptotically, active precharge can employ a switching converter with a buck topology that uses ...